How would you choose an undergraduate field if your long-term goal was to make a meaningful contribution to research on human biology?

I'm trying to identify the field in which I could make the greatest long-term scientific contribution, rather than simply choosing the subject I currently find most interesting.

I'm drawn to research that helps us better understand human beings, especially questions at the intersection of biology, cognition, behaviour and ethics (i am really into philosophy and am good with languages and both creative and scientific writing!). I enjoy connecting ideas across disciplines, thinking about fundamental questions, and communicating complex concepts through writing. However, I'm still unsure whether I would be happiest in a predominantly wet-lab environment or in more computational, theoretical or integrative research.

I'm also uncertain how advances in AI will reshape biomedical research over the coming decades, and whether this should influence the choice of an undergraduate discipline.

If you were advising a student with these interests, what criteria would you use to choose a field? Are there particular traits or experiences that predict whether someone is better suited to neuroscience, genetics, or another area of biomedical research? What do you think will matter most for building a career with lasting scientific impact?

Additional information

At the moment, I'm considering undergraduate Neuroscience programmes in the UK. In Italy, since there isn't really a direct equivalent, I'm also looking at Molecular Genetics as a possible alternative foundation. I'm genuinely open-minded and would value an unbiased perspective on how these paths compare, especially for someone whose ultimate goal is a research career rather than clinical practice.